What glue do you recommend for your parts that accept "glue ins"?
We found that G-S Hypo Cement, available in a small 1/3 oz tube and a needle point tip is easy to use and provides good long term adhesion to glue in flat back crystals. You can find it sold at many bead and craft stores or you can find it at the Tools GS web site.
To glue in Bails and End Caps for glass and other large hole beads, we recommend a two part epoxy. It takes a bit more time to mix and apply, but the epoxy provides the best long lasting solution in this application.